Effect of C/N ratio on denitrification of high-strength nitrate wastewater in anoxic granular sludge sequencing batch reactors

被引：100
作者：
Mohan, T. V. Krishna [1 ]
Nancharaiah, Y. V. [1 ]
Venugopalan, V. P. [1 ]
Sai, P. M. Satya [2 ]
机构：
[1] Bhabha Atom Res Ctr, Chem Grp, Water & Steam Chem Div, Kalpakkam, Tamil Nadu, India
[2] Bhabha Atom Res Ctr, NRB, Waste Immobilizat Plant, Kalpakkam 603102, Tamil Nadu, India
来源：
ECOLOGICAL ENGINEERING | 2016年 / 91卷
关键词：
C/N ratio; Denitrification; Denitrifying granular sludge; High strength nitrate; Sequencing batch reactor; CARBON SOURCE; BIOLOGICAL DENITRIFICATION; DRINKING-WATER; REMOVAL; NITRITE; BIOMASS; BIODEGRADATION; TEMPERATURE; INHIBITION; CAPACITY;
D O I：
10.1016/j.ecoleng.2016.02.033
中图分类号：
Q14 [生态学（生物生态学）];
学科分类号：
071012 ; 0713 ;
摘要：
Denitrification of high strength nitrate wastewater was investigated in granular sludge sequencing batch reactors (SBRs) with the objective of optimizing electron donor requirement, in terms of acetate-carbon to nitrate-nitrogen (C/N) ratio. Three SBRs of each 6L working volume were inoculated with activated sludge and operated in parallel at C/N ratios of 1.5, 2 and 3. Formation of denitrifying granular sludge was observed in all the three SBRs. Complete and stable denitrification of feed containing nitrate up to 5420 mgL(-1) NO3-N was achieved in 24h cycle period for all three C/N ratios studied. However, time for complete denitrification and maximum amount of nitrite accumulation, increased with an increase in C/N ratio. Thus, C/N ratio of 1.5 was found to be optimum for denitrification of high-strength nitrate wastewaters, with acetate as the carbon source. The studies indicate that denitrification in SBRs using granular biomass and acetate as carbon source was highly efficient for denitrification of high strength nitrates. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：441 / 448
页数：8
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